Physics
Which of the following events occurred first ?

Madame Marie Curie became the first woman Nobel Prize winner
Max Planck unveiled the Quantum Theory
Albert Einstein propounded the General Theory of Relativity
Marconi first tranmitted a wireless signal

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Physics
RADAR is used for:

detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.
locating geostationary satellites.
receiving a signals in a radio receiver.

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